WebOption for estat abond artests(#) specifies the highest order of serial correlation to be tested. By default, the tests computed during estimation are reported. The model will be refit when artests(#) specifies a higher order than that computed during the original estimation. The model can only be refit if the data have not changed. http://fmwww.bc.edu/RePEc/bocode/x/xtoverid.hlp

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Web• As with regress, always specify the robust option with xtreg • xtreg, robust will automatically correct for clustering at the level of the panel variable (firms in the previous example) • Note that xtreg can only include fixed effects in one dimension. For additional dimensions, enter the dummies manually (see slide 8) Webxtoverid computes versions of a test of overidentifying restrictions (orthogonality conditions) for a panel data estimation. For an instrumental variables estimation, this is a test of the null hypothesis that the excluded instruments are valid instruments, i.e., uncorrelated with the error term and correctly excluded from the estimated equation.grape plant family

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